Today i'm going to talk about today class.

=> Today, I'm going to talk about our class.
Today i study english

=> Today, I studied English.
I think today lesson is easy.

=> I think that today's lesson is very easy.
I'm so happy.

=> I'm so happy.
Because today is friday!!!!!!!!!!!!!!!!

=>Because today is Friday.
Teacher see you on monday~^^~

=> Teacher, see you on Monday.
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